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Officials said the problems were caused by a "control issue" at the Hemphill Pump Station in northwest Atlanta. Crews were doing routine maintenance when something triggered an alarm, which then shut off the water, causing pressure to drop across much of the system.

Photos: Grocery store shelves empty of bottled water during boil water advisory

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Watershed officials said the system is back to "normal operations," but that further testing was still being conducted before the advisory would be lifted. The advisory, they said, would likely extend into late Tuesday afternoon.